Added CI using Github Actions

[ni-nkozlowski]

As part of our migration from our internal build/CI system.

[codecov[bot]]

Codecov Report

Merging #55 (463b4b8) into master (5f9dd55) will decrease coverage by 3.08%. The diff coverage is 43.75%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   86.18%   83.10%   -3.09%     
==========================================
  Files          96       82      -14     
  Lines        1853     2024     +171     
==========================================
+ Hits         1597     1682      +85     
- Misses        256      342      +86     

Impacted Files	Coverage Δ
audiostream/inc/ni/media/audio/stream_info.h	100.00% <ø> (ø)
audiostream/inc/ni/media/iostreams/positioning.h	85.71% <ø> (ø)
audiostream/src/ni/media/audio/source_impl.h	78.57% <0.00%> (-21.43%)	:arrow_down:
audiostream/src/ni/media/iostreams/device/custom.h	0.00% <0.00%> (ø)
...udiostream/test/ni/media/audio/istream_read.test.h	99.14% <ø> (-0.86%)	:arrow_down:
audiostream/src/ni/media/audio/ifstream.cpp	55.26% <3.22%> (-39.03%)	:arrow_down:
audiostream/src/ni/media/audio/stream_info.cpp	72.72% <42.85%> (-5.54%)	:arrow_down:
audiostream/src/ni/media/audio/aiff/aiff_source.h	67.85% <100.00%> (-0.07%)	:arrow_down:
audiostream/src/ni/media/audio/flac/flac_source.h	84.89% <100.00%> (-0.51%)	:arrow_down:
audiostream/src/ni/media/audio/ogg/ogg_source.h	90.47% <100.00%> (+0.60%)	:arrow_up:
... and 94 more

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[ni-nkozlowski]

We can ignore the codecov failures - we didn't add tests that extended the added api from the last update so it makes sense that there's a reduction of coverage.

I guess going forward we should make sure that the code coverage doesn't go down.